* xstring.cc: (_url_decode) fixed decoding plus sign.
	* Timer.cc, Timer.h: (StopDelayed) new method.
	* Torrent.cc: don't call AnnounceDHT in StartTrackers, do it
	  only by timer; stop dht_announce_timer at the start; use Roll
	  method to set log context; decode magnet URL values properly.
	* DHT.cc: refresh routes after loading the node cache; load the
	  cache quickly using Roll; add some debug log messages.
change copyright year